N/A - USN-4196-1

Executive Summary

Summary
Title	python-ecdsa vulnerabilities

Informations
Name	USN-4196-1	First vendor Publication	2019-11-18
Vendor	Ubuntu	Last vendor Modification	2019-11-18
Severity (Vendor)	N/A	Revision	N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score	N/A	Attack Range	N/A
Cvss Impact Score	N/A	Attack Complexity	N/A
Cvss Expoit Score	N/A	Authentication	N/A
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.10 - Ubuntu 19.04 - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in python-ecdsa.

Software Description: - python-ecdsa: ECDSA cryptographic signature library

Details:

It was discovered that python-ecdsa incorrectly handled certain signatures. A remote attacker could possibly use this issue to cause python-ecdsa to generate unexpected exceptions, resulting in a denial of service. (CVE-2019-14853)

It was discovered that python-ecdsa incorrectly verified DER encoding in signatures. A remote attacker could use this issue to perform certain malleability attacks. (CVE-2019-14859)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.10:
python-ecdsa 0.13.2-2ubuntu0.1
python3-ecdsa 0.13.2-2ubuntu0.1

Ubuntu 19.04:
python-ecdsa 0.13-3ubuntu0.1
python3-ecdsa 0.13-3ubuntu0.1

Ubuntu 18.04 LTS:
python-ecdsa 0.13-2ubuntu0.18.04.1
python3-ecdsa 0.13-2ubuntu0.18.04.1

Ubuntu 16.04 LTS:
python-ecdsa 0.13-2ubuntu0.16.04.1
python3-ecdsa 0.13-2ubuntu0.16.04.1

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/4196-1
CVE-2019-14853, CVE-2019-14859

Package Information:
https://launchpad.net/ubuntu/+source/python-ecdsa/0.13.2-2ubuntu0.1
https://launchpad.net/ubuntu/+source/python-ecdsa/0.13-3ubuntu0.1
https://launchpad.net/ubuntu/+source/python-ecdsa/0.13-2ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/python-ecdsa/0.13-2ubuntu0.16.04.1